A barrel type gear shaping cutter

Abstract

The application provides a barrel type gear shaping cutter and belongs to the technical field of cutters. The application solves the problem of discontinuous cutting process of the gear shaping cutter in the prior art when processing the inner gear ring. The application comprises a cutter body, the cutter body is in a hollow sleeve structure with one side open, the cutter body is provided with an installation flange section integrally formed with the cutter body on one side, the end surface of the installation flange section is an axial positioning reference surface, a central centering hole is arranged on the installation flange section and is arranged through along the axis of the cutter body, a plurality of circumferentially arranged bolt mounting holes are arranged in the cutter body on the outer periphery of the installation flange section, a plurality of cutting teeth are formed on the inner wall of the cutter body close to the end portion, the cutting teeth extend inward, a first relief surface is formed in the cutter body on the outer side of the cutting teeth, and a second relief surface is formed at the tooth root of the cutting teeth. The barrel type cutter body structure is arranged, the cutting teeth are uniformly arranged on the circumference of the end portion of the cutter body, the synchronous meshing continuous cutting of multiple teeth is realized, the tool mark and the vibration mark are eliminated, and the overall rigidity and the anti-chatter capacity are improved by relying on the hollow sleeve structure.

Description

Technical Field

[0001] This invention belongs to the field of cutting tool technology and relates to a cylindrical gear shaping cutter. Background Technology

[0002] Gear shapers are mainly used for shaping complex tooth profiles such as internal gears and stepped gears. Their machining accuracy directly affects the smoothness and reliability of gear transmission. Currently, most conventional gear shapers for machining internal gear rings are non-cylindrical in structure. When machining internal gear rings, the tool structure limits their ability to handle chip jamming, making continuous cutting impossible. Repeated retraction and chip removal are necessary, resulting in low machining efficiency. Furthermore, frequent start-stop cycles can cause fluctuations in tooth profile accuracy and accelerate tool wear, making it difficult to meet the high-precision, high-efficiency batch machining requirements of internal gear rings.

[0003] Chinese patent publication number CN222931937U discloses a gear shaping cutter, including a cutter shank with a square hole on its axis and a square hole positioning surface on the top surface of the hole. A triangular notch is located near the end face of the cutter shank, with one side of the notch perpendicular to the axis of the cutter shank, and the perpendicular surface being the triangular notch positioning surface. A screw hole is provided on the cutter shank, with the axis of the screw hole perpendicular to the side of the square hole. A blade is positioned and installed in the square hole of the cutter shank, with its top surface positioned on the square hole positioning surface and its bottom surface positioned on the triangular notch positioning surface. A fastening screw is installed in the screw hole on the cutter shank, with the tail of the fastening screw resting against the side of the blade.

[0004] The gear shaping cutter provided by this patent can only perform single-point intermittent cutting with a single or a few cutting tools. When machining the internal gear ring, the cutting process is not continuous, and tool marks and vibrations are easily generated. It is impossible to achieve continuous integral forming of the tooth surface in one go. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the prior art by providing a cylindrical gear shaping cutter.

[0006] The objective of this invention can be achieved through the following technical solution: A cylindrical gear shaping cutter includes a cutter body, the cutter body being a hollow sleeve structure with one side open, a mounting flange section integrally formed with the cutter body on one side, the end face of the mounting flange section being an axial positioning reference surface, a central centering hole being provided on the mounting flange section, the central centering hole being provided through the cutter body along the axis of the cutter body, a plurality of circumferentially arrayed bolt mounting holes being formed in the cutter body on the outer periphery of the mounting flange section, a plurality of cutting teeth being formed on the inner wall of the cutter body near the end, the cutting teeth extending inward, a first flank face being formed in the cutter body outside the cutting teeth, and a second flank face being formed at the root of the cutting teeth.

[0007] In the aforementioned cylindrical gear shaper, the angle between the first flank face and the cutting plane is 17°, and the angle between the second flank face and the cutting plane is 6°.

[0008] In the aforementioned cylindrical gear shaper, the module of the cutting teeth is 2mm, the number of cutting teeth is 45, and the axial length of the cutting teeth is 32mm.

[0009] In the aforementioned cylindrical gear shaping cutter, the total axial length of the cutter body is 62.4 mm, a cylindrical surface with a diameter of 80 mm is formed on the cutter body, the diameter of the mounting flange section is 90 mm and the end of the mounting flange section extends out of one side of the cutter body, the axial distance between the cylindrical surface and the mounting flange section is 30 mm, and the maximum outer diameter of the cutter body is 147 mm.

[0010] In the aforementioned cylindrical gear shaper, the tip circle diameter of the cutting tooth is 97mm, the root circle diameter of the cutting tooth is 87mm, and the tooth thickness of the cutting tooth is 3.87mm.

[0011] In the aforementioned cylindrical gear shaping cutter, the tip circle diameter of the cutting tooth is larger than the cylindrical surface diameter, and the cutting tooth protrudes radially outward from the first outer cylindrical surface.

[0012] In the aforementioned cylindrical gear shaper, the surface of the cutting teeth is coated with a wear-resistant coating, the thickness of which is 2-5 μm.

[0013] Compared with the prior art, the cylindrical gear shaping cutter provided by this invention has the following advantages: 1. The cutting teeth are evenly distributed on the end circumference of the cylindrical cutter body. During the cutting process, multiple teeth participate in meshing and cutting simultaneously, resulting in a uniform and stable load without cutting interruption. This allows for continuous cutting of the workpiece tooth surface throughout the entire process, completely eliminating tool marks and chatter marks; 2. The cylindrical cutter body has a symmetrical hollow sleeve structure with a large moment of inertia and overall rigidity far exceeding that of non-cylindrical cutters. This significantly enhances the resistance to deformation and chatter during cutting, allowing for the completion of the entire cutting process from feed to retraction in a stable state without mid-process adjustments or secondary cutting. 3. The cylindrical tool body has an open hollow structure inside, which, together with the open tooth groove at the cylindrical end, provides an ample channel for chip removal, enabling continuous chip removal during the cutting process and avoiding cutting interruptions caused by chip blockage, thus ensuring a smooth and continuous machining process; 4. Through the two-stage clearance angle design of a 17° first clearance face and a 6° second clearance face, the large clearance angle reduces cutting resistance and vibration, while the small clearance angle enhances tooth root strength, avoiding cutting interruptions caused by edge chipping, ensuring the stability of continuous cutting and improving tool life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention.

[0015] In the figure: 1. Tool body; 11. Mounting flange section; 12. Centering hole; 13. Bolt mounting hole; 14. Cutting teeth; 15. First flank face; 16. Second flank face; 17. Cylindrical surface. Detailed Implementation

[0016] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0017] like Figures 1 to 2 As shown, this embodiment is specifically adapted for the precision machining of internal gear rings, including a tool body 1. The tool body 1 is a hollow sleeve-type one-piece molded structure with an opening on one side. A mounting flange section 11 is integrally formed on one side of the tool body 1. The end face of the mounting flange section 11 is the axial positioning reference surface of the tool, providing a precise axial positioning reference for tool installation. A centering hole 12 is opened in the center of the mounting flange section 11 and is arranged through the axis of the tool body 1. It is used to cooperate with the centering shaft of the machine tool spindle to achieve radial centering of the tool body 1 and ensure the coaxiality of the tool body 1 and the spindle. On the tool body 1 on the outer periphery of the mounting flange section 11, there are a number of bolt mounting holes 13 arranged in a circumferential array. The tool body 1 can be fixed to the drive device by bolts to stably transmit cutting torque, while being convenient to disassemble and assemble and securely positioned.

[0018] like Figures 1 to 2 As shown, near the opening end of the inner wall of the tool body 1, several inwardly extending cutting teeth 14 are integrally formed. The extension direction of the cutting teeth 14 is adapted to the tooth groove of the internal gear ring, constituting the core cutting structure for machining the internal gear ring. A first flank face 15 is formed on the outer side of the tool body of the cutting teeth 14, and a second flank face 16 is formed at the tooth root of the cutting teeth 14. The angle between the first flank face 15 and the cutting plane is 17°. The large flank angle can effectively reduce the resistance when cutting the tooth surface of the internal gear ring and reduce the friction between the tool and the machined surface of the internal gear ring. The angle between the second flank face 16 and the cutting plane is 6°. The small flank angle can enhance the tooth root strength and avoid chipping of the cutting edge. The two-stage flank face design takes into account both cutting sharpness and tool durability, ensuring the stability and continuity of the internal gear ring machining process.

[0019] To elaborate further, such as Figures 1 to 2As shown, the cutting tooth 14 has a module of 2mm and 45 teeth, which can achieve precise generating meshing with the same specification internal gear ring and adapt to the processing requirements of specific models of internal gear rings. The axial length of the cutting tooth 14 is 32mm, which provides sufficient axial cutting width for the complete forming of the tooth surface of the internal gear ring, ensuring that the tooth width range of the internal gear ring can be covered in one cut. The tooth tip circle diameter of the cutting tooth 14 is 97mm, the tooth root circle diameter is 87mm, and the tooth thickness is 3.87mm. The tooth profile parameters are precisely matched with the tooth groove size of the internal gear ring to be processed, ensuring the meshing accuracy between the gear shaper and the internal gear ring, avoiding tooth profile interference or meshing clearance deviation, and improving the transmission smoothness of the internal gear ring.

[0020] To elaborate further, such as Figures 1 to 2 As shown, the total axial length of the cutter body 1 is 62.4 mm. A cylindrical surface 17 with a diameter of 80 mm is formed on the cutter body 1. The diameter of the mounting flange section 11 is 90 mm and its end extends out of one side of the cutter body 1. The axial distance between the cylindrical surface 17 and the mounting flange section 11 is 30 mm. The maximum outer diameter of the cutter body 1 is 147 mm. The stepped cylindrical surface design optimizes the moment of inertia of the cutter body section, greatly improves the overall rigidity of the cutter body, and can effectively suppress cutting chatter when machining the internal gear ring, ensuring the machining accuracy of the internal gear ring tooth surface. At the same time, the tip circle diameter of the cutting tooth 14 is larger than the diameter of the cylindrical surface 17, so that the cutting tooth 14 protrudes radially outward from the cylindrical surface 17. Combined with the hollow sleeve structure of the cutter body, the tool can smoothly extend into the interior of the internal gear ring for cutting, effectively avoiding interference between the cutter body and the inner wall of the internal gear ring, and ensuring that the cutting edge can participate in the forming process of the internal gear ring tooth surface throughout the process.

[0021] To elaborate further, the surface of the cutting tooth 14 is also coated with a wear-resistant coating with a thickness of 2-5μm, which can significantly reduce the coefficient of friction when cutting the internal gear ring, reduce tool wear, improve the impact resistance of the cutting edge, effectively extend the tool life, and meet the batch processing needs of the internal gear ring.

[0022] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0023] Although this document uses a variety of terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A cylindrical gear shaping cutter, comprising a cutter body (1), characterized in that: The cutter body (1) is a hollow sleeve structure with an opening on one side. The cutter body (1) has an integrally formed mounting flange section (11) on one side. The end face of the mounting flange section (11) is an axial positioning reference surface. The mounting flange section (11) has a central centering hole (12) which is arranged through the axis of the cutter body (1). The cutter body (1) on the outer periphery of the mounting flange section (11) has a plurality of circumferentially arranged bolt mounting holes (13). The inner wall of the cutter body (1) near the end has a plurality of cutting teeth (14) which extend inward. The cutter body (1) on the outer side of the cutting teeth (14) has a first flank face (15) and a second flank face (16) at the root of the cutting teeth (14).

2. The cylindrical gear shaping cutter according to claim 1, characterized in that: The angle between the first flank face (15) and the cutting plane is 17°, and the angle between the second flank face (16) and the cutting plane is 6°.

3. The cylindrical gear shaping cutter according to claim 1, characterized in that: The cutting tooth (14) has a module of 2mm, a number of teeth of 45, and an axial length of 32mm.

4. The cylindrical gear shaping cutter according to claim 1, characterized in that: The total axial length of the cutter body (1) is 62.4 mm. A cylindrical surface (17) with a diameter of 80 mm is formed on the cutter body (1). The mounting flange section (11) has a diameter of 90 mm and the end of the mounting flange section (11) extends out of the cutter body (1) to one side. The axial distance between the cylindrical surface (17) and the mounting flange section (11) is 30 mm. The maximum outer diameter of the cutter body (1) is 147 mm.

5. The cylindrical gear shaping cutter according to claim 1, characterized in that: The tip circle diameter of the cutting tooth (14) is 97mm, the root circle diameter of the cutting tooth (14) is 87mm, and the tooth thickness of the cutting tooth (14) is 3.87mm.

6. The cylindrical gear shaping cutter according to claim 4, characterized in that: The tip circle diameter of the cutting tooth (14) is larger than the diameter of the cylindrical surface (17), and the cutting tooth (14) protrudes radially outward from the first outer cylindrical surface (17).

7. The cylindrical gear shaping cutter according to claim 1, characterized in that: The surface of the cutting tooth (14) is coated with a wear-resistant coating, the thickness of which is 2-5 μm.

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